Susan can swim 105 meters in 70 seconds. At this rate, how far can she swim in 30 seconds? A. 20 meters B. 35 meters C. 45 meters D. 245 meters

Which sum or difference identity would you use to verify that cos (180° - q) = -cos q? a.) sin (a -b) = sin a cos b – cos a sin b b.) cos (a -b) = cos a cos b – sin a sin b c.) cos (a -b) = cos a cosb + sin a sin b d.) sin (a + b) = sin a cos b + cos a sin b